DE2260900A1 - Screening assembly - for removal and dewatering of coarse solids from effluent - Google Patents

Abstract

Apparatus for the removal and dewatering of coarse solids from liq, pref as a screening plant for water and effluent, comprises a strip type endless mesh with >=1 upwardly running section installed transversely to the flow direction. Partic, the mesh is drawn from a stock roll and taken via an extraction path and a drip path to the discharge posn, pref with a compression zone between the drip path and discharge posn.

Description

Device for removing and dewatering coarse solids from liquids, preferably as a computer system for water and wastewater.

B-e s c h r e i b u n g The invention relates to a device for Removal and dewatering of coarse solids from liquids - preferably as Pitch plant for water and wastewater.

Can be used to remove and dewater coarse solids from liquids Rakes and sieving machines as well as drainage devices in a wide variety of ways Kind of used. One starts from the thought, across the pouring liquid To place screen grids or sieve fields on which the solids are deposited, Most of the built-in screen grids are cleaned by scrapers; Sieve fields are usually linked together endlessly and are removed from the liquid for cleaning led out.

The solids carried along consist partly of fibrous components, which cause particular difficulties for the screening and screening technology, In most cases, incoming fiber will come from the screen grate or screen caught by placing the fiber in front of a slide rule or wire mesh of the sieve lays, the two ends of the fiber are carried by the flowing liquid through the openings next to the slide rule or wire mesh. if the both ends are long enough to loop around you after a certain amount Time the slide rule or the wire mesh. He encamped himself next to an annexed one other fibers, which tangle with each other and with the screen grate or the Siebfeld form a compact structure in the form of slats or plaits, cleaning a rake or sieve element that is clogged in this way is almost impossible. Therefore, the known cleaning devices are very often operated to the Avoid matting. It is taken into account that loopings once formed can no longer be eliminated.

With careful planning, therefore, several rake or sieve mares will be connected in series, with each stage corresponding to a @ We remove solids and fibers. -: are for example at A C-breakdown by definition only precipitated coarse substances. these can and will hardly become matted around the very robust and large slide rule removed in time by the cleaning device, the finer solids occur on the other hand, unhindered through the grate of the coarse breaker, with a downstream Fine rake, in turn, the proportions are correspondingly smaller, so that with Regular cleaning of the screen grate does not apply to the finer fixed pot here either can loop around the bars and become matted.

In the case of screen grates, the solids are stripped off by a IIar1-.e, a comb or the like in itself very difficult because of the movement of the Cleaning device the water is displaced from this device like a surge and the pests are washed away. As a rule, only those are particularly intimate parts adhering to the screen grate are seized by the cleaning device while all other solids are coiled away, T.) this wffe; t is known to everyone the experience of how difficult it is to hand a small one floating in the water Body to grab. So that the screenings deposited on the screen grate through the rake is taken along and not by moving the rake in the water is washed away, the rake often becomes sieve-shaped or approximately sieve-shaped educated. This measure is also unsatisfactory because it is through the sieve opening part of the solids is washed away by the rake.

The conventional trash rack cleaners also have certain requirements to the required Bauwerlr, which is about the geometric size of the pure lifting height for the screenings go far out from the screen grate to the discharge point. In most The cleaning rake is felling over bars by an up and down car emotional. The required clearance height above the drop point of the screenings is therefore depending on the spar length and the additional drive mechanisms.

The actual transport route ends near the corridor and a protective building de would also only have to deal with the task at hand and the drop-off point In today's systems, the protective buildings naturally also serve that purpose Protection of the parts of the computer system that protrude over the conveyor path and the dropping point, namely the so-called rack, the guide frame and the drive station for the cleaning pot. The protective buildings in the conventional systems are therefore much larger than necessary from the task at hand, in the case of a calculation In caverns, an unnecessary clearance profile means increased blasting costs, eo that also for this a restriction of the system to the smallest possible clearance is desirable.

Trash cleaners of the conventional type need at the dropping point either wipers or must be folded down for emptying, apart from The puncture of these parts is also complicated because of the machine work involved The stripping process is pushed by the scraper over the cleaning rake. Uncomfortable oind the stick-slip effect and canting that occurs here. The variety of common ones Bauarten proves the constructive endeavors to solve this problem, the well-known Sieving devices in the form of sieve drums and sieve belts are for taking along of coarser solids only united by additional auxiliary shovels. riie adjusters In addition, a considerably greater mechanical and structural effort ala Computer system and have therefore not generally introduced coarse screening Can.

The further treatment of the screenings is separated from the actual one Screening or screening system made. Means of transport in the form of movable containers, Conveyor belts and the like, dewatering machines and, if necessary, bagging devices connect to the raking and screening systems.

Apart from the expense of such separate devices is also the operating behavior of the control / units to be coordinated with one another only maximum effort to achieve trouble-free.

The invention was based on the complex task of calculating and sieving process, the drainage and, if necessary, the packaging, and the to avoid the disadvantages described.

First of all, the invention is based on the idea of including sieving To carry out a one-time used sieve, close the sieve via a drip line lead and remove together with the screened solids. This is what this is going to be Sieve in the form of a ttetzes or net tape obtained from a supply roll. The drive station Irann is used as a roller press and the net as packaging material at the same time will.

In the following the invention is exemplified by the one in the figure illustrated embodiment explained.

The entire device is in a channel which runs through the channel bottom (17) and the two channel walls (24) is formed transversely to the direction of flow (15) arranged, a ribbon-shaped finite net (t) eats at least one upwards running strand BO stretched from one channel wall (24) to the other that the liquid must pass through the net and that the solids (16) precipitate on the side opposite to the direction of flow (15). The network (1) is preferably above the service floor (23) from a supply roll (2) withdrawn, guided downwards on the pure water side, via a lower deflection (18) and an upper deflection (25), designed for example as a drive, to the discharge point (5) led. The length of the network in operation is therefore the The main thing is to winch the lower deflection (iC) and from a removal line (3) the liquid level (22), a drip section (4) between the liquid level (22) and the upper deflection (25), when using a roller press (?) Additionally from the press section (6) in the area of the roller press and when a packaging is arranged direction from a folding strip (8). The two edges will be in the folding section (8) of the network (1) and when using a locking device, e.g. in a Sack closing device (11) completed. flat this folding section (8) can be a Cutting device be arranged so that the bagged screenings (12) are smaller bagged units emerge at the drop-off point (5).

The net (1) is fed via the lower and upper deflection (1f) and (25) for smaller units freely managed. Either the roughened or jagged surface of the deflection in the net or the net is by frictional engagement of the diversions held or taken away. With larger devices can one or more chains or comparable elements are provided. The fats (13) can be equipped with drivers tl4), which the particularly It is easier to take coarse solids upstairs and also-a safe transport of the network (1) mean.

The device is controlled so that the network can be driven in a known manner is switched on depending on the traffic jam. That means that the network is in a certain Unwinding length is left until the so-called occupancy of the network an unacceptably large traffic jam in front of the network and the desired throughput no longer exists, however, compared to the known computing systems the drive of the network immediately when the traffic jam is cleared or even rorher briefly, when a sufficient throughput is achieved again, it is switched off again. In this way, economical consumption of the netting material is achieved.

The solids (20) are then already draining on the drip section (4) widening. In this question, particularly rough preliminary judgments had to be overcome, which ones related to odor nuisance and the risk of rotting screenings, Even though if you are interested in a quick disposal of the screenings, @ann you at the previous computing systems the exposed @on screenings, especially at the dropping point and on the means of transport. As long as the screenings If it is stored in protected areas and not too long-term, its @trade does not cause unacceptable nuisance under the circumstances. That Storing the screenings on the drip line during the discovery is therefore his Essentially no effective interlocking, especially with today's rubbish accumulation the switch-on times of the mains drive relati @ follow one another in quick succession. For longer The drive can regularly switch on pauses as often as required by means of a timer werder that the screenings are drawn off the drip line in a sufficiently fresh condition will. Furthermore, it is only through the availability of suitable and cheaper mesh materials the operation of a device according to the invention has become economically feasible. Since the mesh material has a similar quality to a large part of the screenings, arises from the increase in the screenings through the packaging material, which the network does not show any difficulty in further handling.

The device allows a particularly simple and direct arrangement a roller press that has meanwhile been introduced in screenings dewatering. Through the Use of the net is also a multiple drop or a multiple handover of the screenings from one means of transport to the other avoided. This does not apply the difficulties involved, in particular pollution the device by screenings escaping from the side. Maintenance of the device has therefore become significantly simplified and also more reliable.

In the bag closing device, depending on the net material used different finishing methods, such as sewing, welding, gluing, can be used. With a sufficient length of the connection point in the withdrawal direction, the cutting device A sufficient seal remains on both sides of the cut so that the bagged screenings are tapped at both ends.

In the folding section, the two net edges can either become one closed tube shape or with a sufficient overlap in a not closed tube shape are placed one on top of the other. This essentially depends on the type of further transport of the packaged screenings. It can turn to the dropping point (5) another packing point with drip-proof material, such as Foils, connect or such a packaging can pass through in the folding section (8) Feeding an additional enclosing film can be made.

by the device t & nn man dzs located on or in the network Feed screenings to a shredding device.

In the previously known devices, this would be necessary because of the Überga @ e and pressure station have been very difficult.

In the case of the object of the invention, the net also runs into the shredding device in and @ is shredded together with the screenings. The high-speed shredding device can be used for air sifting. As is known from chopping machines, here too the shredded material on the one hand by the transferred from the shredding device kinetic energy, on the other hand through that in a high-speed shredding device entrained air flow and thrown away. @ Beneficial with such a thing shredded screenings is the possibility, a Nachpreßabschnitt, in particular but a small roller press to connect. @ierbei could of course the first No roller press (7) is required. The usual roller presses for screenings are @or all large dimensions because of the bulky components. If only shredded If screenings accumulate, the Walzon press can be significantly reduced in size.

The drive of the chain can in another version by pairs counter-rotating, endless covte drives, between which the network is arranged, be formed. This results in a mutual guidance and anchoring of the tensioned Network reached.

@er or the chain drives arranged on the clean water side also be designed as @ etten tapes, so that the network on the entire recording and drip line is supported.

The network itself is beneficial to the practical operation Edge zones and or reinforced at the points of attack of the drive elements and, under certain circumstances. also provided with cams that also guide coarser screenings upwards can.

In addition to the advantages described, the device also provides a Sisher allows fine sieving that has not yet been achieved in wastewater technology. The so far Usual rakes with longitudinal gaps can either be made by using the same mesh size much more effective networks have been replaced and thus a much higher degree of efficiency screening, or by using an extremely close-meshed net a screening of such an order of magnitude can be achieved that the stress values the clarification stages connected to the computer change @@.

The further spread of incineration systems can be a major problem Part of the pollution removed by the device and. in the incinerator be eliminated, without d. "9 first the detour via settling stages or sludge dewatering stages must be taken. In another application, the device can also be used for sieving -on overflows between or llinter further clarification stages are provided and settling stages or replace screening plants of the usual design. In these cases, as with the Extraction of coarse solids, the system in each case around the device for clearing the settled solids and around the device ur cleaning the nm micro-tissues Decreased precipitated solids.

Claims (21)

Expectations 1. Device for removing and dewatering coarse solids liquids, preferably as a computer system for water and wastewater, d a u r c h e k e n n n n e i c h n e t that a band-shaped, finite network at least is angeord net with an upward running strand transversely to the direction of flow. 2. Apparatus according to claim 1, d a d u r c h g e k e n n z e i c It does not mean that the net is pulled off a supply roll and over a de-netting section and a drip path is brought to the dropping point. 3. Apparatus according to claim 1 and 2, d a d u r c h g e k e n n z e i c h n e t that a pressing section is arranged between the drip section and the discharge point is. 4. Apparatus according to claim 3, d a d u r c h g e k e n n z e i c h n e t that the press section is formed by a roller press with at least two rollers will. 5. Apparatus according to claim 3 and 4, d a d u r c h g e k e n n z e i c h n e t that the pressing section is formed by flat pressing elements. 6, device according to claim 1 to 5, d a d u r o h g e k e n n z e i c h n e t that the leaking net in a folding section to a hose-like Structure is reshaped. 7, device according to claim 1 to 6, d a d u r c h g e k e n n z E i c h n e t that the outgoing net through a cutting device transversely to the longitudinal direction is cut up. 8. Apparatus according to claim 6 and 7, d a d u r o h g e k e n n z e i c h n e t that the outgoing network passes through a bag closure device and is delivered in the form of coherent or individual bags. 9. Apparatus according to claim 1 to 8, d a d u r o h g e lt e n n z e i c h ne t that the leaking net is passed through a shredding device will. 10. Apparatus according to claim 9, d u r c h g e k e n n z e i c h n e t that the shredding device is followed by a wind sifting. 11. The device according to claim 10, d a d u r c h g e k e n n z e i without the fact that the wind sifting is followed by an after-pressing strake, 12. Device according to claim 11, that the post-press section is formed by a small roller press. 13. 'orri ¢ htung according to claim 1 to 12, d a d u r c h g e k e n n z e i c h fl 5 t that the Metz is driven by one or more chains with sliders will. 14. The apparatus of claim 1 to 12, d a d u r c h g e k e n n z e i c h n e t that the network is driven by frictionally transmitting elements will. 15. The device according to claim 4 and 14, d a d u r c h g e k e n n z e i c h n e t that the elements are formed by the rollers of the roller press. 16, device according to claim 14, characterized in that the Elements are pairs of counter-rotating, endless chain drives, between which the network is arranged. 17. The device according to claim 14, @ d a d u r c h g e k e n n z e i c h n e t that the elements consist of a pulley or pulleys of the network and additional friction rollers or friction wheels exist. 18. The device according to claim 1 to 12, d a d u r c h g e k e n n z e i c h n e t that the network by driver elements at the upper deflection station is driven, 19. The device according to claim 1 to 18, characterized in that that the network in its edge zones and / or the points of attack of the drive elements is reinforced. 20. Device according to claim 1 to 19, characterized in that the net is provided with cams for taking the goods along. 21. Device according to claim 1 to 20, daduroh g e k e n n z e 1 o n e t that the drive of the network in a known manner is switched on depending on the traffic jam. 22, atoreinrichtung according to claim 1 to 21, d a d u rvc h ge 1: e n n notices that the drive of the network immediately after clearing the traffic jam or is switched off shortly beforehand.